You can't directly "measure" inertia. Inertia is a property of an object, not something you can measure with a tool.

However, you can determine an object's inertia by measuring its mass.

Here's why:

* Inertia is the tendency of an object to resist changes in its motion.

* Mass is a fundamental property of matter that quantifies the amount of matter in an object.

* The greater the mass of an object, the greater its inertia.

So, while you can't measure inertia directly, you can indirectly determine it by measuring the object's mass.

Here's how you might measure mass:

* Using a balance scale: This compares the unknown mass of the object to known standard masses.

* Using a spring scale: This measures the force exerted by gravity on the object, which is proportional to its mass.

Remember, mass is a fundamental measure, and inertia is a consequence of that mass.